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SOME ASPECTS OF THE CIRCUIT DESIGN OF HIGH POWER GTO CONVERTERS
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| Author(s) |
Wolfgang Runge; Andreas Steimel |
| Abstract |
In the field of high power converter, e.g. for traction applications, GTO-thyristors with ratings up to 4.5 kV and 2.5 kA are going to be introduced. The circuit design of GTO converters is determined by the snubber circuits, which are neceasary to release the GTOs from turn-on and turn-off switching losses and to keep the overvoltages caused by GTO switching low. Two snubber arrangements are discussed: the "RCD" snubber together with the di/dt limiting chokes and the unsymmetrical "U" snubber with one common snubber capacitor for a pair of GTOs. Concerning the overvoltage due to switching the same equivalent circuit can be derived for both arrangements. The losses due to the energy stored in the snubber elements are considerably reduced by the U-snubber circuit. The switching losses of high power GTOs are rather high: the turn-on losses are reduced by the U-circuit. The circuit design of the whole inverter and of the arrangement and layout of the di/dt limiting inductors is disscussed. Some measuring results and data of inverters are given. |
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| Filesize: | 653.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-15 by System |
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